High School Physics

# Electric Charge

Last updated on May 14th, 2022 at 01:58 pm

In this post, we will understand the fundamentals of Electric Charge through a set of questions and their answers.

## What is the electric charge?

Electric charge is a physical property of matter which causes it to experience a force when near other electrically charged matter. Electric charge is measured in coulombs (C).

## What is the positive charge?

The positive charge is the type of charge carried by protons. Originally defined as the charge left on a piece of glass when rubbed with silk. The glass becomes positively charged because the silk pulls electrons off the glass.

## What is the negative charge?

The negative charge is the type of charge carried by electrons. Originally defined as the charge left on a piece of amber (or rubber) when rubbed with fur (or wool). The amber becomes negatively charged because the amber pulls the electrons off the fur.

## Define Elementary charge

Elementary charge is the magnitude (amount) of charge on one proton or one electron. One elementary charge equals 1.60 x 10-19 C . Because ordinary matter is made of protons and electrons, the amount of charge carried by any object must be a multiple of the elementary charge.

Note, however, that the quarks that protons and neutrons are made of carry fractional charges; up-type quarks carry a charge of +⅔ of an elementary charge, and down-type quarks carry a charge of −⅓ of an elementary charge. A proton is made of two up quarks and one down quark and carries a charge of +1 elementary charge. A neutron is made of one up quark and two down quarks and carries no charge.

## Define static electricity?

Static electricity is the stationary electric charge, such as the charge left on silk, glass, fur, or amber in the following examples. A positive charge is left on a piece of glass when rubbed with silk. A negative charge is left on a piece of amber (or rubber) when rubbed with fur (or wool).

## What is electric current?

Electric current (sometimes called electricity) is defined as the movement of electrons through a medium (substance) from one location to another. Note, however, that the direction of electric current is defined as the direction a positively charged particle would move. Thus electric current “flows” in the opposite direction from the actual electrons.